EVERY now and then, someone combines two technologies into a single newproduct, and the result is a triumphant new category that changes theindustry. Clock + radio. Cellphone + camera. Music player + hard drive....

the new Nikon P1, due in stores on Sept. 15. It's an iPod-size,eight-megapixel camera dressed in brushed-metal black, with a list price of$550. (A sister model, the P2, is a silver, 5.1-megapixel version that listsfor $400. Online prices will be much lower once the cameras actually arrivein stores.)

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But the best Shoot & Transfer feature of all is a true parlor trick. At aparty, conference or any other social gathering, you can start up a slideshow on your Mac or PC, complete with music. You can then walk around theroom, snapping pictures of the guests or attendees. These photos join theslide show already in progress, automatically, in real time....